Commutator for dynamo-electric machines.



F. W. COX. GOMMUTATOR FOR DYNAMO ELEGTRIG HKCHINES. APPLICATION ripnnAPB. 4.1906.

920,920, Y Patented May 11, 1909.

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WITNESSES I mvtmon ATTORNEY F. W. COX.

COMMUTATOR FOR DYNAMO ELEGTRICMAGHINES.

APPLICATION FILED APR. 4.1906.

Patented May 1 1, 1909.-

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INVENTOR WITNESSES:

ATTORNEY mrnn s'rarns rnTENT. clarion.

FREDEltIKK W. (X, 0F WILKINSBURG, PENNBXLVANIA, ASSIGNOR TO WESTINGHOUSEELECTRIC & MANUFACTURING-COMPANY, A (ORPORATION OF PENNSYLVANIAGOMMUTATOR FOR DYNAMO-ELECTRIC MACHINES.

hieh speeds in operation.

(.ommutators for dynamo electric machines, as heretofore constructed,have usually comprised a. plurality ofiars or segments and a supportinghushing having an annular V- a shaped projection at one end, or aclamping ring which was stationary relative thereto, and an adjustal leclamping rin near its other extremity. were forced together "by anyconvenient means, such'as a nut, scaew-threaded onto the outer er'tremity-of thelushing, or clampingv lzolts whiel'i passed through holesin the rings, were adapted to ei'igag'e complementary notches in thecommutator segments.

lf this construction is used for very loin); commutators, such asil1t1:1({11l19(l for machines which are adapted to receive or to deliverrelatively large values of electric current, the commutator segmentsshow a tendency to lmlge outwardly in the middle by reason of thecentrifugal forces to which they are subjected,particularly in highspeed operation. This dill'icult-y has been avoided in some instancesbyfastenin a ring; around the middle of the outer surface of the com-'nmtator but such a ring diminishes the surface of the commutator whichisavailable for engagement with brushes or current col: lee-tors and mustbe insulated from the com mutator' segments.

Acoordingto my present invention I fasten the commutator segmentssecurely in position without the use of an external ring and employ asupporting bushing which is similar to those employed in the prior art.

Figure 1 of the accompanying drawings is a sectional View, in alongitudinal plane, of one-half of a commutator constructed inaccordance with my invention and Fig. 2 is a similar View whichdiscloses additional means for securely clamping in position commutatorThe clamping rings which Specification of Letters Patent. Applicationfiled April 4, 190a. Serial No. 309,901.

Patented May 11, 1909.

segments of extreme length. Fig. 3 is a plan View of the commutator liarclamping means shown in Fig. l, the commutator bars being omitted andportions of some of the bolts being hroken away. 7 4

Referring to Fig. 1, a bushing 1, which may lie rigidly attached to theshaft of, a dynamo-electric machine. is provided atone end with ananm'ilarV-shaped projection 12.

An adjustable V-shaped ring- 3 is mounted on the bushing 1 near itsopposite end and, to get-her with the V-shaped projection 2, serves tofirmly support the ends of a plurality of commutator segments 4. "Thesegments 4 are assembled in the form of a cylinder and are provided withV-shaped notches 5 and 6 which are, respectively, engaged by a V'-shaped ring 3 and the V-slniped projection 2.

In order to hold the middle of the commutator segments in position, twosimilar, intermediate adjustable V-shaped'rings 7 and 8 are mounted uponthe bushing 1 and respectively engage notches 9 and '10 which are formedin the commutator segments. Holes 11 and 12 are rovid'ed in theintermediate rings 7 and 8 t rough which clamping bolts 13 and 14 maypass and the \f-shaped ring 3 and the projection 2 are also similaropenings 15 and 16 in a ineinent with the holes in the intermediaterings. The

r'ovided with bolts 14 are.adapted to draw the intermediate ring 7toward the stationary project-ion 2 on. the bushing and the bolts 13 areadapted to draw the intermediate ring 8 and the end ring 3 together. Inthis way, all the sup-fl.

porting V-shaped rings are, drawn into the notches in the commutatorsegments with in order to avoid interference and to'distribute theforces exerted upon the rings.

Referring to Fig, 2 the commutatorlllust-rated, is similar to thatofFig. '1 except that the ends of the commutator segments are beveled andsupporting rings ,17 and 18 are bolted, respectively, to the V-shapedring 3 and the projection 2 of the bushing, these rings being providedwith annular pr0jections 19 which are adapted'to engage the beveled endsof the commutator segments. The rings 17 and 18fserveyprincipally, to.hold the ends of the commutatorsegments complementary,

specific arrangement I desire that only such limitations be imposed asare indicated in, the appended claims."

lent 1m as my invention:

1. In a commutator, the combination with segments, and a supporttherefor having a non-adjustable clamping ring,'and e complementaryadjustable clamping ring for said segments, of auxiliary clamping ringswhich engage intermediate portions of the segments.

segments, and a support therefor having an integral clamping ring at ornear one end, and a complementary ad ustable clamping intermediateprojections on the segments. In a commutator, the combination with 1diate rings.

eszopeo.

segments, a support. and four longitudinally spaced clamping rings forsaid segments, of means tending to move alternate rings to wardeachother.

7. In a commutator, the combination with s'egments, a support, and fourclamping rings for said segments-of bolts tending to move elteriiaterings toward each other and projectiiig loosely through holes in theinterme- 8. In a commutator, the combination with segments, a supportingand clamping ring that stationary relative thereto, a complementaryai'ijustable clamping ring near the 2. In a commutator, the combinationwith l ing corresponding opposite end oi" the support, of a pair ofcomplementary intermediate clam ping rings havaround the several ringsand in alinement ring at or near the other end, of gauxihary ad usteblechnnping rings which engage.

segments, and a support therefor having a f non-ad ustable clamping ringat or near one 1 end, and a complementary ad ustabte clamping ring atdrnear the other end, of a pair of auxiliary ad ustableland opposingclamping 'ri'n-gs wnichengage intermediate projections on the segmentsand lllCttllSlOD exerting opposing pressures against said auxiliaryrings.

4. in a commutator, the combination with.

segments, a support, a clamping ring that is stationary rela tixe tosaid support and a \adjustable' clampii'ig ring for said segments, ofintermediate clamping rings therefor and means for exerting pres sureupon alternate rings toward each other.

\ 5. In a'eommuta'to'r, the combination with 5 segments, a support, aclamping ring that is stationary relative to said support and acomplementary, adjustable clamping ring for said segments, ot' a pair ofintermediate adjustable and. opposing the 'et'or and means tending tomove nate rings toward each other.

6; In acommutator, the combination with 1906. clamping rings,

alterinner end, of a V-shaped ring adjustably' monnted upon the oppos teend of the hushing, two oppositely-disposed V-shape'd' rings adjustablymounted upon the bushing intermediate its ends, and clamping boltsbetween each end ring and the opposing intermediate ring.

In testimony whereof, I have hereunto subscribed my name this 28th dayof Mere-h,

' FREDERICK w. cox.

\Vit1iesses:

C. B. Anon, I Burner lim ts.

holes disposei'l at intervals

